Full-disk nonlinear force-free field extrapolation of SDO/HMI and SOLIS/VSM magnetogramsT. Tadesse, T. Wiegelmann, B. Inhester, P. MacNeice, A. Pevtsov and X. SunA&A, 550 (2013) A14DOI: https://doi.org/10.1051/0004-6361/201220044